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A aeration is employed as a treatment option for the removal of several pollutants from contaminated water. Identify the pollutant(s), where aeration is employed as a part of their removal:

1. Iron
2. Cadmium
3. Manganese
4. Zinc

Correct answer: Iron

Solution

Aeration is effective in removing iron from contaminated water because it oxidizes dissolved ferrous iron (Fe2+) into ferric iron (Fe3+), which then precipitates out as solid particles that can be filtered out.

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